public class test {    public static void main(String[] args) {        Scanner in = new Scanner(System.in);        int n = Integer.valueOf(in.nextLine().trim());        if (n == 1) {            System.out.println(1);            return;        }        String[] a=in.nextLine().split(" ");        String[] b=in.nextLine().split(" ");        HashSet<String> set = new HashSet<>();        String[][] dpa = new String[n][n];        String[][] dpb = new String[n][n];        for (int i = 0; i <n ; i++) {            for (int j = 0; j <n-i ; j++) {                if (i==0){                    dpa[i][j]=a[j];                    dpb[i][j]=b[j];                }else {                    dpa[i][j]=dpa[i-1][j]+dpa[0][i+j];                    dpb[i][j]=dpb[i-1][j]+dpb[0][i+j];                }                set.add(dpa[i][j]);                set.add(dpb[i][j]);            }        }        System.out.println(set.size());    }}